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How does “this” keyword work within a function?
...on foo()
{
return "this is " + this.whereAmI + " with " + arguments.length + " + arguments";
}
...with parentheses - foo() - is equivalent to foo.call(undefined) or foo.apply(undefined), which is effectively the same as foo.call(window) or foo.apply(window).
>>> foo()
"this is window...
Flatten list of lists [duplicate]
...ave multiple items in a sublist the list comp will even flatten that. ie
>>> list_of_lists = [[180.0, 1, 2, 3], [173.8], [164.2], [156.5], [147.2], [138.2]]
>>> flattened = [val for sublist in list_of_lists for val in sublist]
>>> flattened
[180.0, 1, 2, 3, 173.8, 164.2...
How to turn NaN from parseInt into 0 for an empty string?
...tly calls ToInt32 to its operands).
var value = s | 0;
// NaN | 0 ==>> 0
// '' | 0 ==>> 0
// '5' | 0 ==>> 5
// '33Ab' | 0 ==>> 0
// '0x23' | 0 ==>> 35
// 113 | 0 ==>> 113
// -12 | 0 ==>> -12
// 3.9 | 0 ==>> 3
Note: ToInt3...
What does the plus sign do in '+new Date'
...ttp://www.jibbering.com/faq/faq_notes/type_convert.html
Other examples:
>>> +new Date()
1224589625406
>>> +"3"
3
>>> +true
1
>>> 3 == "3"
true
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What is the __del__ method, How to call it?
...ences Y and also keeps a copy of Y reference in a global cache (cache['X -> Y'] = Y) then it would be polite for X.__del__ to also delete the cache entry.
If you know that the destructor provides (in violation of the above guideline) a required cleanup, you might want to call it directly, since ...
Adding devices to team provisioning profile
...
@Deminetix Go to Xcode > Preferences > "Accounts" tab > Select your Apple ID (left pane) > Double click on your Team Name. Click "Download All" to refresh your provisioning profiles. Automatic device provisioning isn't as easy turning it...
Swap key with value JSON
...tatic objectFlip(obj) {
const ret = {};
Object.keys(obj).forEach(key => {
ret[obj[key]] = key;
});
return ret;
}
Or using Array.reduce() & Object.keys()
static objectFlip(obj) {
return Object.keys(obj).reduce((ret, key) => {
ret[obj[key]] = key;
return ret;
}, {}...
python numpy machine epsilon
... note that numpy's standard accuracy is 64 (in a 64 bit computer): >>> print(np.finfo(np.float).eps) = 2.22044604925e-16 and >>> print(np.finfo(np.float64).eps) = 2.22044604925e-16
– Charlie Parker
Nov 1 '17 at 17:24
...
Eclipse error: “The import XXX cannot be resolved”
...
Try cleaning your project by going to the following menu item:
Project > Clean...
If that doesn't work, try removing the jars from the build path and adding them again.
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Does python have a sorted list?
...ntainers module.
Installation:
pip install sortedcontainers
Usage:
>>> from sortedcontainers import SortedList
>>> l = SortedList()
>>> l.update([0, 4, 1, 3, 2])
>>> l.index(3)
3
>>> l.add(5)
>>> l[-1]
5
...